Update Dockerfile

.dockerignore

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+.dockerignore
+Dockerfile
+node_modules

Dockerfile

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+FROM node:21-alpine
+
+# Set labels
+LABEL repo="https://github.com/HeyPuter/puter"
+LABEL license="AGPL-3.0,https://github.com/HeyPuter/puter/blob/master/LICENSE.txt"
+LABEL version="v1.2.40-beta"
+
+# Debugging
+RUN apk add --no-cache bash # useful for debugging
+
+# Setup working directory
+RUN mkdir -p /opt/puter/app
+WORKDIR /opt/puter/app
+
+# Add source files
+# NOTE: This might change (https://github.com/HeyPuter/puter/discussions/32)
+COPY . .
+
+# Set permissions
+RUN chown -R node:node /opt/puter/app
+USER node
+
+# Install node modules
+RUN npm cache clean --force \
+    && npm install
+
+EXPOSE 4000
+
+
+CMD [ "npm", "start" ]